Twenty alcoholics are given a test to measure anxiety before and after a one-month detox program.The appropriate design for testing the significance of the difference between the two group means is a
A)between-subjects design.
B)within-subjects design.

Question

Quizplus · Accepted Answer

A within-subjects design is ideal for this situation as each participant serves as their own control, with anxiety levels measured before and after the detox program. This design provides more statistical power to detect potential differences between the two group means. A between-subjects design would require recruiting two groups of participants, one for the pre-test and one for the post-test, which could introduce confounding variables like individual differences in alcohol history and previous treatment experience.

Twenty Alcoholics Are Given a Test to Measure Anxiety Before